How to Run a Commercial EV Charging Installation: From Site Survey to Commissioning

What you will learn

• Confirm cable routes, supply capacity, and bay count in writing before quoting - these three assumptions are the most common source of unrecovered cost on commercial EV charging projects.
• Understand the difference between DNO notification and DNO approval before finalizing your programme: the application route can affect your mobilization date by up to 8 weeks.
• Issue one purchase order per equipment supplier per project, order charger units on the day of contract signing, and require written delivery acknowledgment within 24 hours.
• Civil works and electrical installation are separate phases with separate invoice triggers - treat them that way from the start of every project.
• Commissioning is a documented eight-step process, not a power-on check. A commissioning report, test certificates, and handover pack sign-off are the gate for your final invoice.
• A four-stage payment structure - deposit, civil milestone, installation, commissioning and handover - protects cash flow across a project that can span 6-12 weeks from order to handover.

# How to Run a Commercial EV Charging Installation: From Site Survey to Commissioning

Commercial EV charging is one of the fastest-growing segments in the electrical installation market. The global EV charging infrastructure market was valued at $40.22 billion in 2025 and is projected to reach $238.82 billion by 2033 - a compound annual growth rate of 25.0% (Grand View Research). PwC projects the at-work charging segment alone will account for approximately 6 million charge points by 2030. For electrical contractors and specialist EV installers, that pipeline represents real, repeatable revenue. But the installers who protect margin on these projects are the ones who treat each job as a structured six-phase process rather than a straightforward electrical fit. Missed cable route assumptions, DNO costs arriving after a quote is accepted, and commissioning documentation gaps are the three points where commercial EV charging projects most commonly lose money. This guide covers each phase from initial survey to handover sign-off, with the operational discipline needed to keep every project on budget and invoiced on time.

Phase 1: Site Survey and Written Scope Confirmation

Every commercial EV charging project begins with a site survey. The purpose is not just to assess feasibility - it is to pin down the specific assumptions your quote rests on, in writing, before any price is accepted.

During the survey, confirm the following in writing: the location and rating of the main distribution board or incoming supply (100A single phase, 200A three phase, etc.), the available spare capacity after load assessment, the exact cable route from the supply point to each intended charger position, and the distance in metres for each run. For multi-bay installs, walk every route. A 20-metre cable run that turns into 45 metres once the actual containment path is agreed adds meaningful material cost on SWA cable and containment alone - at 4-6 bays this can amount to $800-$1,500 in unrecovered materials if you did not document the assumed route.

Your survey output should be a written scope confirmation document sent to the customer before any quote is issued. This document records: charger specification per bay (power level, mounting type, tethered or socketed), number of bays and their locations, civil works scope (trenching length, surface type, depth requirements), supply assumptions (confirmed available capacity or flagged as subject to DNO application), and explicit exclusions. Standard exclusions include DNO upgrade costs if supply capacity is insufficient, any electrical remedial works required to the existing supply, and groundworks beyond the agreed trench route.

Phase 2: DNO Application and Programme Planning

The DNO application step is where many commercial EV charging projects encounter unexpected delays - often because the installer did not clarify application type before quoting the programme.

The distinction is straightforward. For smaller commercial installations, where the maximum demand of the charging equipment falls within certain thresholds, the installer can proceed with installation immediately and simply notify the DNO within 28 days of connection. For larger installations where the new load exceeds the threshold - typically anything approaching or above 60-100A of additional demand depending on the DNO - the installer must submit an application and wait for approval before energizing. DNOs are expected to assess these applications within 10 working days, but in practice the process can take 4-8 weeks for larger commercial schemes where network reinforcement studies are required.

Confirm which route applies before finalizing the programme. Load assessment is the installer's responsibility at survey stage: calculate the maximum demand of the proposed chargers, apply diversity factors where appropriate for multi-bay sites, check against the available spare capacity confirmed in the survey, and determine whether the installation can proceed as notification-only or requires a full application. Record this assessment in the job file.

Where a DNO application is required, include programme float of 4-6 weeks between order confirmation and site mobilization. Where DNO costs such as network reinforcement or a new supply connection may arise, include these as a clearly labelled provisional sum in the quote, with a written statement that the actual amount will be confirmed once the application response is received. Do not absorb these costs into your margin on the basis that "it will probably be notification only."

Dynamic load management is worth specifying on any multi-bay site where supply headroom is limited. A properly configured load management controller allows multiple chargers to share available capacity dynamically rather than requiring each charger circuit to be sized for full simultaneous output. This can avoid a DNO upgrade entirely on sites with 3-4 bays, at a fraction of the cost of a supply reinforcement.

Phase 3: Procurement and Equipment Ordering

Once the scope is confirmed and the DNO route is understood, raise purchase orders before anything arrives on site.

Issue one PO per equipment supplier per project. Typical procurement on a commercial multi-bay Level 2 installation will include: charger units and accessories from the charger manufacturer or distributor, SWA cable and containment materials from your electrical wholesaler, distribution board and protection devices as a separate order if not from the same wholesaler, and load management controller if specified. Where groundworks are sub-contracted, issue a separate written booking confirmation and PO to the civils sub-contractor, covering the trench scope, surface reinstatement, and programme dates.

Include the confirmed delivery date on every PO, and require written acknowledgment from each supplier within 24 hours. Commercial EV charger units from most manufacturers carry 4-8 week lead times; order on the day of contract signing, not when mobilization is approaching. A charger unit that arrives late stalls the final commissioning phase and delays the final invoice.

When equipment arrives, check every delivery against the PO before signing the delivery note. For charger units, verify the model number, power rating, connectivity type (tethered or socketed), and accessory pack. Record serial numbers at delivery - you will need them for the commissioning report and warranty registration. Do not sign for a short or incorrect delivery - note the discrepancy on the delivery note and notify the supplier the same day.

Phase 4: Civil Works and Infrastructure

On most commercial EV charging projects, civil works - trenching, ducting installation, and surface reinstatement - are the first operational phase on site. Electrical draw-in follows only after containment is confirmed complete and any concrete or tarmac reinstatement has cured.

Define the civil scope precisely in the works order before any groundworks start. This covers trench route and depth, duct type and size per cable run, inspection chamber or draw-point positions, cable entry points into the distribution board location, and surface reinstatement standard. Where a civils sub-contractor is carrying out this work, their works order should reference the PO number and include programme completion dates.

Raise a stage invoice at civil completion. Civil works and containment installation typically represent 25-35% of a commercial EV charging project's costs in labour and preliminary site work, making this a sensible and defensible payment milestone. Issue the invoice on the day the groundworks are confirmed complete, not at the end of the project.

Before the electrical team mobilizes, confirm the following are in place: all ducts are installed and draw-wires left in place, inspection chambers are accessible, cable entry points are prepared, and any concrete or tarmac around the charger positions has cured sufficiently to allow final mounting work. A half-day delay because duct locations do not match the assumed installation positions costs $400-$800 in unrecovered crew time on a commercial project.

Phase 5: Electrical Installation

Electrical installation proceeds in sequence: distribution board installation and sub-main, cable draw-in through pre-installed containment, charger mounting and final connection, then load management controller installation if applicable.

Track labour against your estimate at each stage. Commercial EV charging installation is straightforward electrical work, but multi-bay projects involve parallel crews on cable draw-in and board work. A labour allocation baseline from the works order - hours per phase, per crew - is the reference point for catching slippage early. If board installation is running 25% over estimate on day one, investigate the cause before the full installation crew has arrived.

Any instruction that takes the electrical work beyond the agreed scope - additional bays added verbally, cable route changes that add material or time, civils issues that require rework - requires a written variation before the additional work proceeds. Confirm the change in scope, the additional cost, and the programme impact in writing with the customer before any out-of-scope work is carried out.

Raise a stage invoice at installation complete - charger units mounted and connected, board installation finished, load management controller in place. Do not wait until commissioning to trigger this payment. Installation complete and commissioning are separate milestones and should be invoiced separately.

Phase 6: Commissioning, Testing, and Handover

Commissioning is a structured process, not a power-on check. Complete it in sequence, document every step, and do not issue the final invoice until the handover pack is signed.

Work through commissioning in this order:

1. Carry out insulation resistance tests on all cable runs before energizing. Record results per circuit with the cable reference, test voltage, and result in megaohms.
2. Complete continuity and polarity checks on all circuits at the distribution board. Confirm earth fault loop impedance at each charger position.
3. Energize the distribution board and test RCD or RCBO operation at each circuit. Record trip times.
4. Power on each charger unit individually. Confirm the unit initializes, displays ready status, and shows the correct power rating on the display or network dashboard.
5. Complete a charging test at each bay: connect a test vehicle or load tester, initiate a charging session, and confirm the unit delivers the correct output in kilowatts. For networked chargers, confirm the session is visible and logged in the network back-end.
6. On multi-bay sites with load management, test charger power sharing under simultaneous load. Confirm the controller limits combined output to the agreed maximum demand and that each charger adjusts output as other bays are activated.
7. Test RFID authentication (where fitted): present each RFID card or tag, confirm session authorization is logged correctly in the management platform.
8. Submit DNO notification if the installation is notification-only and 28 days have not yet elapsed since energizing.

After commissioning is complete, compile the handover pack before leaving site. This includes: test certificates per charger (serial number, circuit reference, test results), Electrical Installation Certificate covering the installation, charger user guides and quick-start cards, network management platform login credentials, RFID card allocation log, warranty registration confirmation for each unit, and a commissioning report summarizing test results and any noted items.

The handover pack is presented to the customer or site manager for sign-off. That sign-off triggers the final invoice. Issue the final invoice the same day as handover sign-off - not at the end of the week, not when the accounting system is next opened.

Stage Payment Structure

Structure every commercial EV charging project on a four-stage payment schedule confirmed in the order confirmation:

• Deposit (25-35% at order confirmation): covers charger unit procurement and programme commitment
• Civil/infrastructure complete (25-30%): raised on groundworks and containment completion
• Installation complete (20-25%): raised when charger units are mounted and connected
• Commissioning and handover (15-20%): triggered by handover pack sign-off

Define these milestones and their trigger conditions explicitly in the order confirmation. A payment schedule that references "milestones to be agreed" is not a payment schedule - it is an invitation for a payment dispute.

Running commercial EV charging projects through a single job record that links purchase orders, works orders, and stage invoices to one cost view gives you the margin visibility to know, at each phase, whether the project is tracking to budget. That cost picture - committed POs against the budget, labour hours against the estimate, provisional DNO sum against any confirmed application outcome - is the control mechanism that separates a profitable EV charging installation business from one that is delivering good technical work at uncertain margins.

A project delivered on programme, with clean documentation and a commissioning report the customer can file, builds the relationship that generates the next multi-bay project from the same customer or their facilities manager's referral network. The technical work is the ticket to entry. The operational process is what makes it repeatable.

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